Learn · Tutorials
Structured, beginner-friendly courses on Python, Java, JavaScript, Salesforce Apex, Lightning Web Components and REST APIs. Clear explanations, real code you can run, and a course outline that always shows where you are.
Tracks
Every track is free and reads like a course. Start at lesson one, or jump to any chapter.
Learn Python from zero: a free chapter-by-chapter course with clear diagrams, runnable code, the output of every example, exercises and quizzes.
Learn Java from scratch with a free chapter-by-chapter course: OOP, collections, streams, exceptions and threads, with diagrams and verified code output.
Learn modern JavaScript step by step: variables, functions, closures, arrays, objects, classes, async/await, the DOM and fetch, with diagrams and runnable code.
Learn SQL step by step with MySQL: SELECT, WHERE, JOINs, GROUP BY, subqueries, window functions, CTEs, indexes and transactions, with real query results.
Learn C programming step by step: variables, operators, loops, functions, arrays, strings, pointers, memory, structures and files, with programs you can run.
Learn modern C++ step by step: classes, references, smart pointers, templates and the STL – vector, map, set, sort – plus DSA and competitive programming.
Learn TypeScript step by step: types, interfaces, unions, narrowing, generics, classes and utility types, with strict-mode examples for React, Angular and Node.
Learn React 19 from scratch: components, props, state, hooks, forms and actions, React Router, performance and TypeScript, with examples you can follow.
Learn Next.js 16 step by step: App Router, layouts, Server and Client Components, data fetching, caching, Server Actions, SEO and deployment, with tested code.
Learn Salesforce Lightning Web Components step by step: templates, events, Lightning Data Service, Apex, datatables, modals, testing and interview prep.
Learn REST APIs from HTTP basics to production: design, status codes, Node.js and Express, auth with JWT, caching, idempotency, webhooks and OpenAPI.
Learn the JavaScript behind Lightning Web Components: classes, modules, arrays, async/await with Apex, events, shadow DOM, errors, security and Jest tests.
Learn Salesforce Apex from scratch to pro: SOQL, DML, triggers, governor limits, batch and queueable Apex, test classes, security and interview prep.
How it works
Each track is a short course: chapters in order, from the first concept to real-world patterns.
Lessons take 5–15 minutes. The outline on the right shows what is coming.
Copy any example with one click, then change it and run it in your own org or editor.
Your progress is saved in this browser, so you always know where to continue.
FAQ
Yes. Every tutorial and lesson on LearnFrenzy is free to read, with no sign-up. Your progress is saved in your browser.
Each track is arranged as a course: start with the first chapter and follow the "Next lesson" button. Every lesson builds on the ones before it, and the chapter list on the left shows where you are.
It helps but is not required. Apex uses Java-like syntax, and the Apex track starts from the fundamentals: variables, data types and how Apex runs on the Salesforce platform.
Each track shows its total reading time. Most learners finish a lesson in a single sitting; practising the code examples usually takes as long again.
Share this page with your study group or placement batch.